Variations in morphology and patency of disposable hydrodissection cannulas used in cataract surgery
Bibliographic record
Abstract
PURPOSE: To perform a detailed laboratory assessment of the variability in morphology (shape of opening port and surface finishing) and patency of Chang-style hydrodissection cannulas used in cataract surgery. SETTING: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah. DESIGN: Experimental study. METHODS: 44 disposable cannulas from 3 different manufacturers were evaluated in this study. 17 cannulas were primed with solution and then underwent analyses under gross and light microscopy. 27 other cannulas were directly removed from the package and underwent the same abovementioned analyses, before priming. Selected cannulas from the 3 manufacturers were also evaluated under scanning electron microscopy and surface analyses for elemental composition. RESULTS: There was variability in all parameters evaluated in this study, including opening ports that were irregular in shape, partially or totally blocked, and a cannula with a second, lateral opening port. The surface finishing of the tips of the cannulas was also variable, with cannulas exhibiting irregular and/or sharp edges, as well as what seemed to be debris/residues. Fluid streams obtained with the cannulas also varied, and although some cannulas produced a normal stream, others produced a weak stream, no stream, or double stream. All cannulas were composed of stainless steel, and debris/residues seemed to correspond to organic residues. CONCLUSIONS: The findings in this study raise concerns about potential damage to the capsule and toxic anterior segment syndrome. Priming before use in surgery is advisable to confirm appropriate fluid flow.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".